To browse use the GIT web interface:
The source code can be checked out anonymously over HTTPs by doing:
git clone https://git-wip-us.apache.org/repos/asf/syncope.git
Syncope's git repo is automatically mirrored on github at: https://github.com/apache/syncope.
You can fork that repository, commit changes to your fork, and submit pull requests through GitHub's pull request mechanisms.